این تست کنید

 void ff() {
var tempReport = new StiReport();
//var stream = new MemoryStream();
//tempReport.ExportDocument(StiExportFormat.Pdf, stream);




var printerSettings = new PrinterSettings
{
PrinterName = @"\\ServerName\PrinterShareName"
};
tempReport.PrinterSettings.PrinterName = printerSettings.PrinterName;
tempReport.Print();
}